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Ok as some had pointed out my estimate was off so here is an updated version with the like for like parts:
Nameless header (ceramic coated): $1500
Nameless full 3" headerback with helmholtz resonator and mufflers: $1849
ECU tune (cable + lic + file): $825 (maybe add $300 more if you want it custom on a dyno?)
Air Filter: $50
Thermostat: $100
Total: $4324 (shelf tune) or $4624 (dyno tune)
Cosworth 1.3 retail: $5250
Difference: $926 or $626
Honestly though, for anyone staying NA my original 2.5 comparison is a better one. 3" is unnecessary for NA and if you look at the reviews from people who have purchased the 3" nameless exhausts many have said it is very loud and raspy to the point of making them unhappy with their purchase.
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